'\" te
.\" Copyright (c) 2007, Sun Microsystems, Inc. All Rights Reserved.
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.TH DDI_INTR_GET_PRI 9F "Jun 04, 2007"
.SH NAME
ddi_intr_get_pri, ddi_intr_set_pri \- get or set priority of a given interrupt
.SH SYNOPSIS
.nf
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

\fBint\fR \fBddi_intr_get_pri\fR(\fBddi_intr_handle_t\fR \fIh\fR, \fBuint_t\fR *\fIprip\fR);
.fi

.LP
.nf
\fBint\fR \fBddi_intr_set_pri\fR(\fBddi_intr_handle_t\fR \fIh\fR, \fBuint_t\fR \fIpri\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI).
.SH PARAMETERS
\fBddi_intr_get_pri()\fR
.sp
.ne 2
.na
\fB\fIh\fR\fR
.ad
.RS 8n
DDI interrupt handle
.RE

.sp
.ne 2
.na
\fB\fIprip\fR\fR
.ad
.RS 8n
Pointer to the priority returned for this handle
.RE

.sp
.LP
\fBddi_intr_set_pri()\fR
.sp
.ne 2
.na
\fB\fIh\fR\fR
.ad
.RS 7n
DDI interrupt handle
.RE

.sp
.ne 2
.na
\fB\fIpri\fR\fR
.ad
.RS 7n
Contains the priority to be set
.RE

.SH DESCRIPTION
The \fBddi_intr_get_pri()\fR function returns the current priority of the
interrupt handle \fIh\fR of a given device. Upon a successful return,
\fIprip\fR points to a small integer value, typically in the
\fBDDI_INTR_PRI_MIN\fR...\fBDDI_INTR_PRI_MAX\fR range, that represents the
current software priority setting for the interrupt. See <\fBsys/ddi_intr.h\fR>
for values of \fBDDI_INTR_PRI_MIN\fR or \fBDDI_INTR_PRI_MAX\fR.
.sp
.LP
The \fBddi_intr_get_pri()\fR function can be called any time, even if the
driver adds an interrupt handler for the interrupt specification.
.sp
.LP
The software priority returned from \fBddi_intr_get_pri()\fR can be used in
calls to \fBmutex_init()\fR and \fBrw_init()\fR.
.sp
.LP
The \fBddi_intr_set_pri()\fR function sets the priority \fIpri\fR of the
interrupt handle \fIh\fR of a given device. The function validates that the
argument is within the supported range.
.sp
.LP
The \fBddi_intr_set_pri()\fR function can only be called prior to adding the
interrupt handler or when an interrupt handler is unassigned. \fBDDI_FAILURE\fR
is returned in all other cases.
.SH RETURN VALUES
The \fBddi_intr_get_pri()\fR and \fBddi_intr_set_pri()\fR functions return:
.sp
.ne 2
.na
\fB\fBDDI_SUCCESS\fR\fR
.ad
.RS 15n
On success.
.RE

.sp
.ne 2
.na
\fB\fBDDI_EINVAL\fR\fR
.ad
.RS 15n
On encountering invalid input parameters.
.RE

.sp
.ne 2
.na
\fB\fBDDI_FAILURE\fR\fR
.ad
.RS 15n
On any implementation specific failure.
.RE

.sp
.ne 2
.na
\fB\fBDDI_ENOTSUP\fR\fR
.ad
.RS 15n
On device not supporting operation.
.RE

.SH CONTEXT
The \fBddi_intr_get_pri()\fR and \fBddi_intr_set_pri()\fR functions can be
called from kernel non-interrupt context.
.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
.TE

.SH SEE ALSO
.BR attributes (7),
.BR ddi_intr_alloc (9F),
.BR ddi_intr_enable (9F),
.BR mutex_init (9F),
.BR rw_init (9F)
.sp
.LP
\fIWriting Device Drivers\fR
.SH NOTES
The priority returned from \fBddi_intr_get_pri()\fR should be typecast by
calling the \fBDDI_INTR_PRI\fR macro before passing it onto
\fBmutex_init\fR(9F).
.sp
.LP
Consumers of these interfaces should verify that the return value is not equal
to \fBDDI_SUCCESS\fR. Incomplete checking for failure codes could result in
inconsistent behavior among platforms.
